AATR an ionospheric activity indicator specifically based on GNSS measurements | Journal of Space Weather and Space Climate

Space weather effects on GNSS and their mitigation

Open Access

Fig. 6

Maximum daily AATR values for 2014 as a function of the longitude and month, for receivers situated at low-latitude (). The solid black lines indicates the two times per year when the horizontal component of the Earth magnetic field is aligned the Solar Terminator (thence α = 0°), at the geomagnetic equator.

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